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P

P&D

Pickup and Delivery (of freight).

Piggyback

The transportation of truck trailers and containers on railway flatcars.

Prepaid

A term used to designate that the shipper (consignor) is responsible for the freight charges (or a 3rd party identified by the shipper).

Profit Center

A department set up within a company where the department charges for its service (to its customers which are other departments within the same company).  In transportation, a private fleet set up as a profit center will compare income versus cost, and will compare its performance against commerical carriers.

Pup-Trailer

A short semi-trailer used jointly with a dolly and another semi-trailer to create a twin trailer.